Temperature-Dependent Dispersion Coefficients of Alkali Metals Using Equation of State

In this study, a temperature-dependent of the dispersion coefficients is calculated from equation state.The Lennard-Jones LJ (۱۲-۶-۳) effective pair potential function and simple thermodynamic argumentwith the input PVT data of liquid metals are used to calculate the dispersion coefficients. The dispersioncoefficients ( , , ) ۳ ۶ ۱۲ C C C are found to be a linear function of ۱/T۱+α , where T is the temperature and αis a constant and has different values for different dispersion coefficients. The law of corresponding statesbased on the reduced dispersion coefficients and reduced temperature is used to verify the validity of a LJ(۱۲-۶-۳) potential function in describing the dispersion coefficients. By applying the dispersion coefficientsof alkali metals and potential function plots, the values of molecular parameters (å , ó , and, m r ) have beenobtained. The LJ (۱۲-۶-۳) potential function conclusively predicts the best dispersion coefficients of thethree alkali metals (K, Rb, and Cs).

Keywords:

Dispersion Coefficient , Equation of state , Alkali Metals